bjoernager/rust
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Adding str::reserve

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Kevin Cantu 2012-02-04 14:56:42 -08:00 • committed by Brian Anderson
parent d3dfe8758d
commit 6be25c8a0c
3 changed files with 18 additions and 0 deletions
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10
src/libcore/str.rs
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@ -97,6 +97,7 @@ export
as_buf,
//buf,
sbuf,
reserve,
unsafe;
@ -105,6 +106,7 @@ export
#[abi = "cdecl"]
native mod rustrt {
fn rust_str_push(&s: str, ch: u8);
fn str_reserve_shared(&ss: str, nn: ctypes::size_t);
}
// FIXME: add pure to a lot of functions
@ -755,6 +757,7 @@ Apply a function to each character
*/
fn map(ss: str, ff: fn(char) -> char) -> str {
let result = "";
reserve(result, byte_len(ss));
chars_iter(ss, {|cc|
str::push_char(result, ff(cc));
@ -1302,6 +1305,13 @@ An unsafe buffer of bytes. Corresponds to a C char pointer.
*/
type sbuf = *u8;
// Function: reserve
//
// Allocate more memory for a string, up to `nn` + 1 bytes
fn reserve(&ss: str, nn: uint) {
rustrt::str_reserve_shared(ss, nn);
}
// Module: unsafe
//
// These functions may create invalid UTF-8 strings and eat your baby.